3-D IC device with enhanced contact area
First Claim
1. A device comprising:
- a substrate comprising an upper surface and a recess extending into the substrate from the upper surface;
the recess having a bottom and sides extending between the upper surface and the bottom, the sides comprising first and second sides oriented transversely to one another;
a stack of alternating active and insulating layers overlying the upper surface of the substrate and the recess;
each of a plurality of said active layers having an upper portion extending along an upper plane over and generally parallel to the upper surface and a lower portion extending along a lower plane over and generally parallel to the bottom;
each of the plurality of said active layers comprising first and second upward extensions positioned along the first and second sides and extending from the lower portions of their respective active layers; and
a plurality of conductive strips adjoining the second upward extensions of the plurality of said active layers.
1 Assignment
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Accused Products
Abstract
A device includes a substrate with a recess, having a bottom and sides, extending into the substrate from the substrate'"'"'s upper surface. The sides include first and second sides oriented transversely to one another. A stack of alternating active and insulating layers overlie the substrate'"'"'s surface and the recess. At least some of the active layers have an upper and lower portions extending along upper and lower planes over and generally parallel to the upper surface and to the bottom, respectively. The active layers have first and second upward extensions positioned along the first and second sides to extend from the lower portions of their respective active layers. Conductive strips adjoin the second upward extensions of the said active layers. The conductive strips can comprise sidewall spacers on the sides of the second upward extensions, the conductive strips connected to overlying conductors by interlayer conductors.
15 Citations
20 Claims
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1. A device comprising:
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a substrate comprising an upper surface and a recess extending into the substrate from the upper surface; the recess having a bottom and sides extending between the upper surface and the bottom, the sides comprising first and second sides oriented transversely to one another; a stack of alternating active and insulating layers overlying the upper surface of the substrate and the recess; each of a plurality of said active layers having an upper portion extending along an upper plane over and generally parallel to the upper surface and a lower portion extending along a lower plane over and generally parallel to the bottom; each of the plurality of said active layers comprising first and second upward extensions positioned along the first and second sides and extending from the lower portions of their respective active layers; and a plurality of conductive strips adjoining the second upward extensions of the plurality of said active layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for forming electrical connections with active layers of a stack of alternating active and insulating layers of a device, the method comprising:
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forming a recess in a substrate, the substrate comprising an upper surface with the recess extending into the substrate from the upper surface, the recess having a bottom and sides extending between the upper surface and the bottom, the sides comprising first and second sides oriented transversely to one another; forming a stack of alternating active and insulating layers over the upper surface of the substrate and the recess; the stack forming step comprising; forming an upper portion of each of a plurality of the active layers to be along an upper plane and over and generally parallel to the upper surface; and forming a lower portion of each of the plurality of active layers to be along a lower plane and over and generally parallel to the bottom; and forming first and second upward extensions of each of the plurality of active layers to be positioned along the first and second sides and to extend from the lower portions of their respective active layers; and during the stack forming step, forming conductive strips adjoining the second upward extensions of the plurality of active layers. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification